KR100489461B1 - Scroll Type Compressor - Google Patents

Abstract

A spiral fixed scroll tooth 2a protrudes from the end plate 2b of the fixed scroll 2, and a spiral movable scroll tooth 4a protrudes from the end scroll 4b of the movable scroll 4. The end plate 4a of the movable scroll 4 is provided with a discharge port 8 for discharging the compressed refrigerant gas. The pressure chamber 16 is provided in the back side of the end plate 2b. The port 10 which communicates with the pressure chamber 16 is provided in the position which opposes the discharge port 8 of the end plate 2b. As a result, the compressed fluid flows into the pressure chamber, whereby a scroll compressor is obtained in which the pulsation when the fluid is discharged is reduced.

Description

Scroll Compressor {Scroll Type Compressor}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, and more particularly, to a scroll compressor in which pulsation generated when the compressed high pressure fluid is discharged is reduced.

As an example of the conventional scroll compressor, an in-axis discharge scroll compressor for discharging the compressed high-pressure refrigerant gas into the casing through a passage provided in the drive shaft for driving the compressor will be described.

As shown in FIG. 4, in the sealed casing 101, partition walls 125 are used to divide the suction chamber 123 and the discharge chamber 122.

In the suction chamber 123, a scroll compression mechanism 103 for sucking and compressing the refrigerant gas is provided.

The scroll compression mechanism 103 is composed of a fixed scroll 110 and a movable scroll 111. The spiral fixed scroll teeth 110b protrude from the end plate 110a of the fixed scroll 110. A spiral movable scroll tooth 111b protrudes from the end plate 111a of the movable scroll 111. The compression chamber 114 is formed by engaging the movable scroll teeth 111b with the fixed scroll teeth 110b.

On the side of the fixed scroll 110, a suction port 110c for supplying the low pressure refrigerant gas sent from the suction pipe 105 to the compression chamber 114 is provided. On the other hand, near the center of the end plate 111a of the movable scroll 111, a discharge port 111c for discharging the compressed and high-pressure refrigerant gas is formed.

The motor 107 is accommodated in the discharge chamber 122. The scroll compression mechanism 103 is driven by the crank part 130 provided in the upper end side of the drive shaft 108 of the motor 107. The drive shaft 108 is provided with a discharge gas passage 108e for guiding the refrigerant gas discharged from the discharge port 111c to the discharge gas outlet 108f on the lower side of the drive shaft 108.

A suction pipe 105 for sending refrigerant gas to the scroll compression mechanism 103 is connected to a portion of the casing 101 on the suction chamber 123 side. On the other hand, a discharge tube 106 for discharging the high-pressure refrigerant gas to the outside of the casing 101 is connected to the discharge chamber 122 side of the casing 101.

Next, the above-described scroll compressor operation will be described.

Rotation of the motor 107 is transmitted to the compression mechanism 103 through the drive shaft 108 and the crank portion 130. As a result, the movable scroll 111 idles with respect to the fixed scroll 110. By the idle drive of the movable scroll 111, the compression chamber 114 formed by the movable scroll teeth 111b and the fixed scroll teeth 110b moves while contracting toward the center from the outer peripheral portion.

By this operation, the low pressure refrigerant gas sent from the suction pipe 105 to the compression chamber 114 through the suction port 110c is compressed to become high pressure, and is discharged from the discharge port 111c of the movable scroll 111.

The high pressure refrigerant gas discharged from the discharge port 111c flows out from the discharge gas outlet 108f into the discharge chamber 122 through the discharge gas passage 108e provided in the drive shaft 108. The high pressure refrigerant gas flowing into the discharge chamber 122 is sent out of the casing from the discharge tube 106 through a gap between the motor 107 and the casing 101.

However, the above-described scroll compressor has the following problems.

The compression chamber formed by the movable scroll teeth 111b and the fixed scroll teeth 110b moves helically from the outer circumferential portion toward the center with the idle drive of the movable scroll 111. At this time, after the refrigerant gas compressed in one compression chamber 114 is discharged from the discharge port 111c, the refrigerant gas compressed in the next compression chamber is discharged.

In the compression mechanism 103, such a discharge operation is intermittently performed together with the idle drive of the movable scroll 111, so that the refrigerant gas to be discharged pulsates. Since the refrigerant gas pulsates, the drive shaft 108 may vibrate, especially when the refrigerant gas passes through the discharge gas passage 108f.

In addition, depending on the operating conditions of the scroll compressor, noise may occur due to resonance of the natural frequency and the pulsation frequency of the drive shaft 108.

1 is a partial longitudinal sectional view of a scroll compressor according to a first embodiment of the present invention;

2 is a partial longitudinal sectional view of a scroll compressor according to a second embodiment of the present invention;

3 is a partial longitudinal sectional view of a scroll compressor according to a third embodiment of the present invention;

4 is a longitudinal sectional view of a conventional scroll compressor.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a scroll compressor which suppresses the generation of vibration and noise by suppressing pulsation of discharge gas.

The scroll compressor according to the present invention includes a first scroll, a second scroll, a discharge port, a pressure chamber, and a port. In the first scroll, a first spiral body protrudes from the end plate. In the second scroll, a second spiral member for engaging the first spiral member to form a compression chamber is provided on the end plate. The discharge port is provided in the end plate of one of the first and second scrolls. The pressure chamber is provided on the back of the scroll of the other of the first and second scrolls. The port is provided in the end plate of the other scroll and communicates with the pressure chamber.

According to the scroll compressor, the fluid compressed in the compression chamber flows into the pressure chamber, whereby the pulsation of the fluid can be suppressed and the vibration and noise generated by the pulsation can be suppressed.

Suitably, the pressure chamber is formed from the scroll and the lid on the other side.

In this case, the pulsation of the fluid flowing into the pressure chamber can be prevented from directly affecting the casing of the scroll compressor.

Also suitably, it is provided in the end plate of the other scroll, and is provided with the relief port for leading the fluid under compression to a pressure chamber, and the relief valve which opens and closes the said relief port.

In this case, when the pressure of the fluid in the compression chamber during compression becomes higher than the pressure in the pressure chamber, the relief valve opens and the fluid in the compression chamber during compression flows into the pressure chamber, whereby the pressure in the compression chamber during compression is reduced. The pressure difference between the compression chamber pressure and the discharge pressure immediately before communicating with the discharge port is reduced while the overcompression is suppressed without rising above the pressure of the discharge port, and the pulsation of the discharge fluid when the compression chamber communicates with the discharge port is reduced. Can be further suppressed. Moreover, even when the timing which flows in into a pressure chamber via a relief valve and the timing which discharges from a discharge port shifts, the pressure of a fluid is leveled and the pulsation of a fluid is reduced.

More suitably, the discharge port is in communication with a passage provided in the drive shaft for driving the first scroll or the second scroll.

In this case, in the so-called in-axis discharge scroll type compressor having a passage through which fluid flows in the drive shaft, vibration of the drive shaft and the like can be effectively suppressed.

Also suitably, the first scroll is a fixed scroll, the second scroll is a movable scroll, and the port is provided for the fixed scroll.

In this case, the port communicating with the pressure chamber or the pressure chamber is formed on the fixed scroll side, so that the pressure chamber and the port can be formed more easily than in the case where the port is formed on the movable scroll side.

<First Embodiment>

A scroll compressor according to a first embodiment of the present invention will be described.

As shown in FIG. 1, the scroll compression mechanism 1 for inhaling and compressing refrigerant gas is provided in the airtight casing 20. As shown in FIG. The scroll compression mechanism 1 is composed of a fixed scroll 2 and a movable scroll 4. The end plate 2b of the fixed scroll 2 is provided with a helical body (hereinafter referred to as "fixed scroll tooth 2a").

The end plate 4b of the movable scroll 4 is provided with a helical body (hereinafter referred to as "movable scroll tooth 4a"). The compression chamber 29 is formed by engaging the movable scroll teeth 4a with the fixed scroll teeth 2a.

The scroll compression mechanism 1 is disposed on the framework 6, and in particular, the fixed scroll 2 is fixed to the framework 6 by bolts 3 or the like.

An upper portion of the casing 20 is connected with a suction pipe 18 for sending refrigerant gas to the scroll compression mechanism 1. On the other hand, the discharge tube (not shown) for sending out high pressure refrigerant gas to the exterior of the casing 20 is connected to the side surface of the casing 20.

On the outer circumferential side of the fixed scroll 2, a suction port 21 for sending a low pressure refrigerant gas sent from the suction pipe 18 to the compression chamber is provided. On the other hand, a discharge port 8 for discharging the compressed and high-pressure refrigerant gas is formed near the center of the end plate 4b of the movable scroll 4.

A motor (not shown) is accommodated below the casing 20. The scroll compression mechanism 1 is driven through the crank part 30 provided on the upper end side of the drive shaft 5 of the motor. The crank part 30 is accommodated in the crank chamber 7 provided in the framework 6. The drive shaft 5 is provided with a discharge gas passage 5a for guiding the refrigerant gas discharged from the discharge port 8 to the discharge gas outlet (not shown) at the lower end side of the drive shaft 5.

In this scroll compressor, in particular, the pressure chamber 16 is provided on the back side of the scroll, that is, the fixed scroll 2, on which the discharge port 8 is not provided. The end plate 2b of the fixed scroll 2 facing the discharge port 8 is provided with a port 10 for guiding the refrigerant gas to be discharged into the pressure chamber 16. In addition, the pressure chamber 16 is formed of the fixed scroll 2 and the lid 17.

Moreover, in this scroll type compressor, the relief port 12 for preventing overcompression at the time of compression, the relief valve 14 which opens and closes the relief port 12, and the relief port valve 14 raise A valve guard 14a is provided to regulate the pressure.

The relief port 12 communicates the compression chamber 29 and the pressure chamber 16 during compression. The relief valve 14 and the valve guard 14a are disposed in the pressure chamber 16 and are fixed to the rear surface of the fixed scroll 2 by bolts 15.

The scroll compressor according to the present embodiment is configured as described above.

Next, the above-described scroll compressor operation will be described.

Rotation of the motor 107 is transmitted to the scroll compression mechanism 1 through the drive shaft 5 and the crank part 30, and the movable scroll 4 idle-drives against the fixed scroll 2. By the idle drive of the movable scroll 4, the compression chamber 29 formed by the movable scroll teeth 4a and the fixed scroll teeth 2a moves while contracting from the outer peripheral part toward the center part.

As a result, the low pressure refrigerant gas sent from the suction pipe 18 to the compression chamber 29 through the suction port 21 is compressed. The compressed, high-pressure refrigerant gas is discharged from the discharge port 8 of the movable scroll 4.

The high pressure refrigerant gas discharged from the discharge port 8 enters into the casing 20 from the discharge gas outlet (not shown) provided on the lower end side of the drive shaft 5 via the discharge gas passage 5a provided in the drive shaft 5. Spills. The high pressure refrigerant gas flowing into the casing 20 is sent out of the casing 20 from the discharge pipe.

In this series of operations, in this scroll type compressor, when the high-pressure refrigerant gas is discharged from the discharge port 8, the pressure chamber 16 is provided through a port 10, a part of which is provided at a position facing the discharge port 8. Flows into.

As a result, as compared with the case where the high-pressure refrigerant gas flows directly from the discharge port 8 into the discharge gas passage 5a, the pulsation of the refrigerant gas is suppressed by introducing the refrigerant gas into the pressure chamber 16, thereby driving the drive shaft 5 This vibration can be suppressed. In addition, the fixed frequency of the drive shaft 5 and the frequency of the pulsation are resonant, and noise can be prevented from occurring.

In addition, depending on the driving situation, the fluid pressure in the compression chamber 29 during compression may be higher than the pressure of the discharge port 8 or the discharge pipe. That is, it may be in an overcompression state.

At this time, when the pressure of the refrigerant gas in the compression chamber 29 during compression is higher than the pressure in the pressure chamber 16, the relief valve 14 is opened and the refrigerant gas during compression in the compression chamber 29. Is introduced into the pressure chamber 16 through the relief port 12.

As a result, the pressure in the compression chamber 29 during compression does not rise above the pressure in the pressure chamber 16, the overcompression is suppressed, and the pressure and the discharge pressure of the compression chamber immediately before communication with the discharge port 8. The difference in pressure between the two and the other becomes small, and the pulsation of the refrigerant gas discharged when the compression chamber communicates with the discharge port 8 can be further suppressed.

In addition, when the timing at which the refrigerant gas flows into the pressure chamber 16 through the relief valve 14 and the timing at which the refrigerant gas is discharged from the discharge port 8 are shifted, the pressure of the refrigerant gas is leveled, thereby reducing the pulsation of the refrigerant gas. have.

Moreover, in this scroll type compressor, by placing the pressure chamber 16 and the port 10 on the fixed scroll 2 side, it becomes possible to form them more easily.

Moreover, although the pressure chamber 16 is formed with the fixed scroll 2 and the cover 17, since the cover 17 is provided, the pulsation of the refrigerant gas can be prevented from being directly transmitted to the casing 20. In addition, the suction pipe 18 can be prevented from overheating.

Second Embodiment

A scroll compressor according to a second embodiment of the present invention will be described.

As shown in FIG. 2, in the scroll compressor according to the present embodiment, a pressure chamber 16 is formed on the rear side of the movable scroll 4. That is, the pressure chamber 16 is provided in the crank chamber 7 provided in the framework 6 for accommodating the crank part 30 of the movable scroll 4.

For this reason, the port 10 is formed in the vicinity of the center of the movable scroll 4, and the concave portion 9a for guiding the high pressure refrigerant gas into the pressure chamber 16 in the drive shaft 5 and the boss portion 4c. And passages 9b and 9c are formed. Moreover, the sealing mechanism 11 for sealing the pressure chamber 16 is provided between the framework 6 and the drive shaft 5.

The end plate 4b of the movable scroll 4 has a relief port 12 for preventing overcompression during compression, a relief valve 14 for opening and closing the relief port 12, and the relief port. A valve guard 14a is provided to regulate the rise of the valve 14.

The relief port 12 communicates the compression chamber 29 and the pressure chamber 16 during compression. The relief valve 14 and the valve guard 14a are disposed in the pressure chamber 16 and fixed to the rear surface of the movable scroll 4 by bolts 15.

On the other hand, the fixed scroll 2 is provided with a discharge port 8 for discharging the compressed high-pressure refrigerant gas. The dome 20a is provided with a discharge tube 19 for discharging the discharged refrigerant gas to the outside of the casing 20.

In addition, since the structure of this structure is the same as that of the scroll compressor shown in FIG. 1 demonstrated in 1st Example, the same code | symbol is attached | subjected to the same member, and the description is abbreviate | omitted.

Next, the operation of the scroll compressor described above will be described.

By the rotation of the drive shaft 5, the movable scroll 4 is idle driven with respect to the fixed scroll 2. By the idle drive of the movable scroll 4, the compression chamber 29 formed by the movable scroll teeth 4a and the fixed scroll teeth 2a moves while contracting from the outer peripheral part toward the center part.

Thereby, the low pressure refrigerant gas sent from the suction pipe 18 to the compression chamber 29 through the suction port 21 is compressed, becomes high pressure, and is discharged from the discharge port 8 of the fixed scroll 2. The high pressure refrigerant gas discharged from the discharge port 8 is sent out of the casing 20 from the discharge tube 19 provided in the dome 20a through the space in the dome 20a.

In this series of operations, in this scroll type compressor, when the high-pressure refrigerant gas is discharged from the discharge port 8, the recessed portion 9a through a port 10 provided at a position opposite to the discharge port 8. And flows into the pressure chamber 16 via the passages 9b and 9c.

As a result, as compared with the case where the high-pressure refrigerant gas flows directly from the discharge port 8 into the space in the dome 20a, the pulsation of the refrigerant gas is suppressed by introducing the refrigerant gas into the pressure chamber 16, thereby preventing the dome 20a. Furthermore, the vibration can be suppressed from being transmitted to the casing 20.

In addition, as in the case of the first embodiment, when the pressure of the refrigerant gas in the compression chamber 29 during compression in the overcompression state is higher than the pressure in the pressure chamber 16, the relief valve 14 is opened and compressed. The refrigerant gas during compression in the chamber flows into the pressure chamber 16 through the relief port 12.

As a result, the pressure in the compression chamber 29 during compression does not rise above the pressure in the pressure chamber 16, the overcompression is suppressed, and the pressure in the compression chamber 29 immediately before communicating with the discharge port 8. The pressure difference between the pressure and the discharge pressure becomes small, and the pulsation of the refrigerant gas discharged when the compression chamber 29 communicates with the discharge port 8 can be further suppressed.

In addition, when the timing at which the refrigerant gas flows into the pressure chamber 16 through the relief valve 14 and the timing at which the refrigerant gas is discharged from the discharge port 8 are shifted, the pressure of the refrigerant gas is leveled, thereby reducing the pulsation of the refrigerant gas. have.

Third Embodiment

A scroll compressor according to a third embodiment of the present invention will be described.

As shown in Fig. 3, the scroll compressor according to the present embodiment is a so-called co-rotating scroll compressor in which two scrolls 22 and 24 are driven together. That is, the drive scroll 22 rotates by the rotation of the drive shaft 22c, and the driven scroll 24 idle-drives the drive scroll 22 by the shaft coupling 26.

The helical drive scroll teeth 22a protrude from the end plate 22b of the drive scroll 22. A spiral driven scroll tooth 24a protrudes from the driven scroll 24 end plate 24b. The compression chamber 29 is formed by engaging the driven scroll teeth 24a with the drive scroll teeth 22a.

The drive scroll 22 is provided with a discharge port 8 for discharging the compressed high pressure refrigerant gas. The pressure chamber 16 is formed in the back side driven scroll 24 of the end plate 24b. In the end plate 24b of the driven scroll 24 facing the discharge port 8, a port 10 for guiding the refrigerant gas to be discharged into the pressure chamber 16 is formed.

The end plate 24b of the driven scroll 24 has a relief port 12 for preventing overcompression during compression, a relief valve 14 for opening and closing the relief port 12, and the relief port. A valve guard 14a is provided to regulate the rise of the valve 14.

The relief port 12 communicates the compression chamber 29 and the pressure chamber 16 during compression. The relief valve 14 and the valve guard 14a are disposed in the pressure chamber 16 and fixed to the end plate 24b by the bolts 15.

The drive shaft 22c is provided with a discharge gas passage 22d for guiding the refrigerant gas discharged from the discharge port 8 to the discharge gas outlet (not shown) on the lower end side of the drive shaft 22c. The casing 20 is provided with a discharge tube 19 for discharging the discharged refrigerant gas to the outside of the casing 20.

Next, the above-described scroll compressor operation will be described.

The drive scroll 22 rotates by the rotation of the drive shaft 22c. In accordance with the rotation of the drive scroll 22, the driven scroll 24 idles with respect to the drive scroll 22 via the shaft joint 26. By the idle drive of the driven scroll 24, the compression chamber 29 formed by the drive scroll teeth 22a and the driven scroll teeth 24a moves while contracting from the outer circumference toward the center.

Thereby, the low pressure refrigerant gas sent from the suction pipe 18 to the compression chamber 29 through the suction port 21 is compressed, becomes high pressure, and is discharged from the discharge port 8 of the drive scroll 22. The high-pressure refrigerant gas discharged from the discharge port 8 passes from the gas discharge port (not shown) provided on the lower end side of the drive shaft 22c to the inside of the casing 20 through the discharge gas passage 22d formed in the drive shaft 22c. Spills. The refrigerant gas flowing into the casing 20 is sent out of the casing 20 from the discharge pipe 19 provided in the casing 20.

In this series of operations, in this scroll type compressor, a part of the refrigerant gas compressed in the compression chamber 29 flows into the pressure chamber 16 through the port 10 when discharged.

As a result, as compared with the case where the high-pressure refrigerant gas flows directly from the discharge port 8 into the discharge gas passage 22d, the pulsation of the refrigerant gas is suppressed by introducing the refrigerant gas into the pressure chamber 16, thereby driving the drive shaft 22c. This vibration can be suppressed. In addition, it is possible to prevent the occurrence of noise due to resonance of the natural frequency of the drive shaft 22c and the frequency of pulsation.

As in the case of the first embodiment, the relief valve 14 opens and compresses when the pressure of the refrigerant gas in the compression chamber 29 during compression in the overcompression state is higher than the pressure in the pressure chamber 16. The refrigerant gas during the compression in the chamber 29 flows into the pressure chamber 16 through the relief port 12.

As a result, the pressure in the compression chamber 29 during compression does not rise above the pressure in the pressure chamber 16, the overcompression is suppressed, and the pressure and the discharge pressure of the compression chamber immediately before communication with the discharge port 8. Can be further suppressed, and the pulsation of the refrigerant gas discharged when the compression chamber communicates with the discharge port 8 can be further suppressed.

In addition, when the timing at which the refrigerant gas flows into the pressure chamber 16 through the relief valve 14 and the timing discharged from the discharge port 8 are shifted, the refrigerant gas pressure is leveled to reduce the pulsation of the refrigerant gas.

In the scroll compressor according to the present invention, as in the case of the first embodiment or the third embodiment, in the in-axis discharge scroll compressor, it is effective to suppress the vibration of the drive shaft or reduce the generation of noise due to resonance.

INDUSTRIAL APPLICABILITY The present invention is effectively applied to a structure for suppressing pulsation in a scroll compressor for discharging a compressed high pressure fluid.

Claims (5)

First scrolls 2 and 4 provided with first spiral bodies 2a and 4a protruding from end plates 2b and 4b; Second scrolls 2 and 4 protruding from the end plate with second spiral bodies 2a and 4a for engaging the first spiral bodies 2a and 4a to form a compression chamber 29; A drive shaft is provided on the end plates 2b and 4b of one of the scrolls 2 and 4 of the first and second scrolls 2 and 4 to drive the first scroll 2 or the scroll 4. A discharge port 8 in communication with the passage 5a provided in (5), A pressure chamber 16 provided on the rear side of the scrolls 2 and 4 on the other side of the first and second scrolls 2 and 4, It is provided on the end plates 2b and 4b of the other scrolls 2 and 4, and has a port 10 in communication with the pressure chamber 16, which port is substantially opposite to the discharge port 8. And is located in a substantially straight line through the end plate of the other scroll along the extending direction of the drive shaft (5). The scroll compressor according to claim 1, wherein the pressure chamber (16) is formed of the other scroll (2, 4) and the cover (17). 2. A relief port (12) according to claim 1, which is provided on the end plates (2b, 4b) of said other scrolls (2, 4), for guiding fluid during compression into said pressure chamber (16). A scroll compressor having a relief valve (14) for opening and closing the relief port (12). delete The method of claim 1, wherein the first scroll is a fixed scroll (2), The second scroll is a movable scroll 4, Said port (10) is provided for said fixed scroll (2).